Scotland data:
https://www.ed.ac.uk/files/atoms/files/scotland_firstvaccinedata_preprint.pdf
Peak efficacy was at 84% at 28-35 days after vaccination. The following week it was down to 61% and the next week 58%.
Here is a German study from this month on
Age-dependent immune response to the Biontech/Pfizer BNT162b2 COVID-19 vaccination
https://www.medrxiv.org/content/10.1101/2021.03.03.21251066v1
“While the majority of participants in both groups produced specific IgG antibody titers against SARS-CoV-2 spike protein, titers were significantly lower in elderly participants. Although the increment of antibody levels after the second immunization was higher in elderly participants, the absolute mean titer of this group remained lower than the <60 group. After the second vaccination, 31.3 % of the elderly had no detectable neutralizing antibodies in contrast to the younger group, in which only 2.2% had no detectable neutralizing antibodies.”
“Peak efficacy was at 84% at 28-35 days after vaccination. The following week it was down to 61% and the next week 58%.” (only seen in the tables at the end of article)
This is a new phenomena for me. I will suspend belief/disbelief to the degree that I can (until actually published/confirmed), but keep it in mind.
I had the impression that immunity was more persistent, from other reports.